Improvement in elevators



2 Sheets-$heet 1. V

\ W. HAMILTON.

ELEVATOR.

No.104,'731.. Patented June 28, 1870.

2 SheetsSheet 2.

W. HAMILTON.

ELEVATOR.

No. 104,731. Patented J ne 28, 1870.

Illlhl Illil "am-a swat 'wILInI-an .nA ILToN, ;0EALLEGHENY orrr,PENhlSYLVANIA.

.' Letters Patent N 104,731, dated June 28, 1870.

mraovnmsnr 11v ntnva'roas.

I :The-S ohednle 391181165 'to'in these Letters Patent and making partof the same.

To all whcm itmcgj concern:- a

1 Be it known that 1,-W1'LLIAM HAMILTON, of the city and county ofAllegheny and State of Pennsylvania, have liifinted anew and usefulImprovement in Elevators and I do hereby declare that the following is afull, clear, and, exact description thereof, referencebeihg had to theaccompanying drawing and to the letters of reference marked thereon.

I .The nature of my invention consists in raising and lowering theplatform of an elevator through the medium of a rack made insections,-andendless screws, operatedby suit-able driving-gear.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation. 1

' -In the accompanying drawing, which forms part of myJs pccificatiom- Iy E'gure, 1 is a side elevation of my improvement in elevators. l

Figure 2 is a transverse section, at liney. of fig. 1, of. the timbersto which are attached the slides for the racks and platform,representing, .also', a transverse section ofthe slidesa nd racks,with'the slides-racks, and timbers arranged in juxtaposition. Figure 3is. a top view or plan of the driving-gear used for operating theendlessscrews.- 1

Figure 4 is a face view of two sections of the rack.

' Figure 5 is a transverse section of the rack.

In the'accompanying drawingthe elevator.

A represents the floor of the building, provided with and theirdriving-gear, all of which are supported in a frame consisting ofplatesB O'andoolumns 4. .The timbers B, to which are attached the slideso,

for the racks in, are properly secured between the floors-of each storyof the building, and may extend from the first to the upper story whenso desired.

The rack m is madein sections, and pivoted together, as shown at a infigs. land 4, and are provided with grooves, in fig. 2.

" The teeth lot the racks m are arranged at an angle corresponding tothe inclination of the thread oflthe endless screws D.

The two sections ot' the rack m directly attachedto the platform I haveblank surfaces, 12-, which are equal to the length of the endless screws1). These blanks are-for the purpose'of causing .the endless screws to.become unshipped from the racks m, and the drivinggear tocchtinn'e.in-niotion without liability of injury go. it or-the platform 1 i a Thea rrangement of tiie driving-gear, which consist'so'f, bevel-wheels c fgh '6 J' K, and a tight pulley,

5, and loose pulleys 6, and the relation that said gear o, intoivhichare fitted the slides 0, as shown bears to the endless scrcwsl), andtheir connection with racksm'and platform P, is all clearly shown infigs. l and 4, and. will readily be understood; by the, skillfulmechanic. l I

'To the under side of the platform P arepivoted, at S, twostarting-racks, R, to which are attached togglelevers c, a, t, and a,which are operated upon by the spring 10, so as to hold the pivotedracks It out of gear with relation to the endless screws D;

, As the construction and arrangement of theseveral partsof 'myimprovement in elevators will be readily understood from the foregoingdescription, and b'y ref ereucc to the accompanying drawing, I will,therefore, proceed to describetheoperation. I I

llhe platform being lowered, so that the teeth I of "the twolracksdirectly attachedto the platform have passed'below and out of gear withthe endless screws D, so that they will be opposite to the blanks of the;racks,ngv byrevolving the shaft 0: through the, me-

dium of suitable belts, which are'arranged, with relation to the pulleys'5 and 6, so as to reverse 131181110 tion 'of said shaft x', .whicharrangement of belts and --pulleys for that purpose is well understoodby-skilled mechanics, the shaft at will revolve the wheel e, which Iwill revolve wheels f and g, which will revolve wheels h and i,,whichwill revolve wheels J and K, which will involve the endless screws bothin the same direc tion. N ow, by drawing upon lever :11, it will raiseup 'one'end of the lever t, and force downward'the other end of it,which, pressing, on the levers u and 27, will I I y y a s bring theteeth I of 4 the pivotedracks B into gear Below the flour-.A arearranged-the endless screws screws 1), and the rotating-of the endlessscrews will cansethe platform-to commence ascending, and there-.by'bring the teeth I of the rack in into gearwith the threads of theendless screws De. The operator then releases his hold on the lever :t,aud the spring w will force with the threads of the lower end ofthe-endless the racks Rand the lovers connected thereto into the'position shown in fig. 1, and the rotating of the end less screws Dwill cause the platform 1? to ascend until the upperthreads of theendless screws have passed the last tooth in the last'sections of theracks m. The

platform P descends by'reversiuggth'e driving-gear,

which is accomplished by shifting t'heYdriving-belts'; The lowersections of the racksm, in their descent, coming against theguidcs'ygwvill cause them to slide ofi'to the right and left of theelevator; or the sec whereby; the platform may be elevated to anydesired height, and requiresyhu't:littleroom below the first floor ofthe building fort-he racks m.

Second-in arranging the two sections of the racks Having thusdescribedthe nature, construction, 0p-- oration, and advantages of myimprovement,

'tt hat-I claim as of my invention is l. 'Gonstructing the rack m withgrooves 0', made i112 sections, and pivoted together, substantially asherein described, and for the purpose set forth.

2. The use of the pivoted racks It, in combination with the endlessscrews 1), substantially a s herein described, ahd for the purpose setforth.

3. The combination and arrangement of the levers a: t u v and spring 10with the pivot-ed rack R, as herein described,.a-ud for the purpose setforth.

4. Providing the two upper sections of the rack m with blank spaces 12,arranged, with relation to the endless screws 1), so that the teeth ofsaid section of the rack shall become uushipped fiom the threads of saidscrews, substantially as herein described, and for the purpose setforth.

5. The arrangement of the beveled wheels 0] g I: t J K and endlessscrews D, constructed, arranged, and operating, with relation to theracks m, substantially as herein described.

WILLIAM HAMILTON. Witnesses:

. A. O. J onxsrox,

JAS. G. Tuonrsos.

